LIMA, Peru — Peruvian archeologists have discovered in a sacred pre-Incan site the bodies of 16 men from China who arrived to South America almost two centuries ago as semi-enslaved workers.

The secret tomb in Lima is the biggest burial site of Chinese migrants ever found in Peru and was presented Thursday to journalists. Found alongside the bony remains were opium pipes and other personal objects used by the migrants.

As many as 100,000 Chinese migrants arrived to Peru in the second half of the 19th century and for little pay performed back-breaking work on farms, building railroads and removing guano, which is bird excrement coveted as fertilizer.

The Chinese were discriminated against even in death, having to be buried in the pre-Incan sites after being barred from cemeteries reserved for Roman Catholics.